{"product_id":"philips-pronto-tsu-9800-replacement-battery-37v-2200mah-li-polymer","title":"Philips TSU-9800 Remote Replacement Battery 3.7V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips Pronto TSU-9800 Series — 3.7V Li-Polymer Replacement Battery (310420052281)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2200mAh Li-Polymer battery replaces the internal rechargeable cell in the Philips Pronto TSU-9800 and TSU-9800I advanced programmable remote controls, along with the RC9800I Multimedia Control Panel and Pronto PC9800I\/17. The original cell degrades after repeated charge cycles, causing the remote to lose range or stop holding a charge. This replacement matches the OEM voltage, capacity, and form factor of part number 310420052281.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTSU-9800 series compatibility:\u003c\/strong\u003e\n    The TSU-9800, TSU-9800I, PC9800I\/17, and RC9800I share the same internal battery bay, connector, and 3.7V single-cell BMS architecture — which is why one cell covers all five variants in this line.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the Pronto's BMS handshake and confirmed charge acceptance at the correct 4.2V cutoff. The BMS did not flag any cell rejection errors during initial conditioning.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eConnector seating on the TSU-9800:\u003c\/strong\u003e\n    The JST-style connector on this cell must click fully into the socket before closing the rear panel. A half-seated connector causes intermittent power loss that looks like a dead battery — press until you hear the click.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Pronto TSU-9800 stops holding a charge after 2–3 years\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells in always-docked remotes degrade faster than cells that go through full discharge cycles. The TSU-9800 typically sits in its charging cradle continuously, which keeps the cell at 100% — a state that accelerates cathode degradation in Li-Polymer chemistry. After 300–500 charge cycles, or roughly 2–3 years of daily use, capacity drops below the threshold the Pronto's BMS considers a valid charge. At that point the remote may show a full charge indicator but lose power within hours of leaving the cradle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePronto TSU-9800 IR range drops sharply after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the remote now requires line-of-sight or closer range than before, the new cell may not be fully charged from the factory — Li-Polymer cells ship at storage voltage, typically around 3.6–3.7V, not the 4.2V full-charge level. The IR LED driver in the TSU-9800 draws peak current at transmission; a cell below full charge cannot sustain that burst cleanly, which cuts effective range. Place the remote in the charging cradle for a full charge cycle before use, and verify the charge indicator reaches its maximum state before testing range.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416106598490,"sku":"BWCS-PSU9800RC-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416106631258,"sku":"BWCS-PSU9800RC-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416106664026,"sku":"BWCS-PSU9800RC-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PSU9800RC-1.webp?v=1779760330","url":"https:\/\/batteryweb.com\/products\/philips-pronto-tsu-9800-replacement-battery-37v-2200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}